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163 lines
3.7 KiB
C
163 lines
3.7 KiB
C
/*
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* Bus Glue for the built-in EHCI controller of the Ralink RT3662/RT3883 SoCs
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*
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* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
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*
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* Parts of this file are based on Ralink's 2.6.21 BSP
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/platform_device.h>
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#include <asm/mach-ralink/rt3883.h>
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#include <asm/mach-ralink/rt3883_ehci_platform.h>
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static int ehci_rt3883_init(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int ret;
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ehci->caps = hcd->regs;
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ehci->regs = hcd->regs +
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HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
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dbg_hcs_params(ehci, "reset");
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dbg_hcc_params(ehci, "reset");
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ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
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ehci->sbrn = 0x20;
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ehci_reset(ehci);
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ret = ehci_init(hcd);
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if (ret)
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return ret;
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ehci_port_power(ehci, 0);
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return 0;
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}
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static const struct hc_driver ehci_rt3883_hc_driver = {
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.description = hcd_name,
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.product_desc = "Ralink RT3883 built-in EHCI controller",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2,
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.reset = ehci_rt3883_init,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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.get_frame_number = ehci_get_frame,
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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static int ehci_rt3883_probe(struct platform_device *pdev)
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{
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struct rt3883_ehci_platform_data *pdata;
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struct usb_hcd *hcd;
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struct resource *res;
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int irq;
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int ret;
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if (usb_disabled())
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return -ENODEV;
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res) {
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dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
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dev_name(&pdev->dev));
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return -ENODEV;
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}
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irq = res->start;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_dbg(&pdev->dev, "no base address specified for %s\n",
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dev_name(&pdev->dev));
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return -ENODEV;
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}
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hcd = usb_create_hcd(&ehci_rt3883_hc_driver, &pdev->dev,
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dev_name(&pdev->dev));
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = res->end - res->start + 1;
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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dev_dbg(&pdev->dev, "controller already in use\n");
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ret = -EBUSY;
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goto err_put_hcd;
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}
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hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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dev_dbg(&pdev->dev, "error mapping memory\n");
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ret = -EFAULT;
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goto err_release_region;
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}
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pdata = pdev->dev.platform_data;
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if (pdata && pdata->start_hw)
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pdata->start_hw();
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ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (ret)
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goto err_iounmap;
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return 0;
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err_iounmap:
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iounmap(hcd->regs);
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err_release_region:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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err_put_hcd:
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usb_put_hcd(hcd);
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return ret;
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}
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static int ehci_rt3883_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct rt3883_ehci_platform_data *pdata;
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usb_remove_hcd(hcd);
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iounmap(hcd->regs);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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usb_put_hcd(hcd);
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pdata = pdev->dev.platform_data;
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if (pdata && pdata->stop_hw)
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pdata->stop_hw();
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return 0;
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}
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static struct platform_driver ehci_rt3883_driver = {
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.probe = ehci_rt3883_probe,
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.remove = ehci_rt3883_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "rt3883-ehci",
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}
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};
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MODULE_ALIAS("platform:rt3883-ehci");
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